The Element interface represents an element in an HTML or XML
document. Elements may have attributes associated with them; since the
Element interface inherits from Node, the
generic Node interface attribute attributes may
be used to retrieve the set of all attributes for an element. There are
methods on the Element interface to retrieve either an
Attr object by name or an attribute value by name. In XML,
where an attribute value may contain entity references, an
Attr object should be retrieved to examine the possibly
fairly complex sub-tree representing the attribute value. On the other
hand, in HTML, where all attributes have simple string values, methods to
directly access an attribute value can safely be used as a convenience.

Note: In DOM Level 2, the method normalize is
inherited from the Node interface where it was moved.

getAttributeNS

Retrieves an attribute value by local name and namespace URI.
Per [XML Namespaces]
, applications must use the value null as the
namespaceURI parameter for methods if they wish to have
no namespace.

Parameters:

namespaceURI - The namespace URI of the attribute to retrieve.

localName - The local name of the attribute to retrieve.

Returns:

The Attr value as a string, or the empty string
if that attribute does not have a specified or default value.

Throws:

DOMException - NOT_SUPPORTED_ERR: May be raised if the implementation does not
support the feature "XML" and the language exposed
through the Document does not support XML Namespaces (such as [HTML 4.01]).

getAttributeNodeNS

Retrieves an Attr node by local name and namespace URI.
Per [XML Namespaces]
, applications must use the value null as the
namespaceURI parameter for methods if they wish to have
no namespace.

Parameters:

namespaceURI - The namespace URI of the attribute to retrieve.

localName - The local name of the attribute to retrieve.

Returns:

The Attr node with the specified attribute local
name and namespace URI or null if there is no such
attribute.

Throws:

DOMException - NOT_SUPPORTED_ERR: May be raised if the implementation does not
support the feature "XML" and the language exposed
through the Document does not support XML Namespaces (such as [HTML 4.01]).

getElementsByTagNameNS

Returns a NodeList of all the descendant
Elements with a given local name and namespace URI in
document order.

Parameters:

namespaceURI - The namespace URI of the elements to match on. The
special value "*" matches all namespaces.

localName - The local name of the elements to match on. The
special value "*" matches all local names.

Returns:

A new NodeList object containing all the matched
Elements.

Throws:

DOMException - NOT_SUPPORTED_ERR: May be raised if the implementation does not
support the feature "XML" and the language exposed
through the Document does not support XML Namespaces (such as [HTML 4.01]).

getSchemaTypeInfo

getTagName

The name of the element. If Node.localName is different
from null, this attribute is a qualified name. For
example, in:

<elementExample id="demo"> ...
</elementExample> ,

tagName has the value
"elementExample". Note that this is case-preserving in
XML, as are all of the operations of the DOM. The HTML DOM returns
the tagName of an HTML element in the canonical
uppercase form, regardless of the case in the source HTML document.

hasAttributeNS

Returns true when an attribute with a given local name and
namespace URI is specified on this element or has a default value,
false otherwise.
Per [XML Namespaces]
, applications must use the value null as the
namespaceURI parameter for methods if they wish to have
no namespace.

Parameters:

namespaceURI - The namespace URI of the attribute to look for.

localName - The local name of the attribute to look for.

Returns:

true if an attribute with the given local name
and namespace URI is specified or has a default value on this
element, false otherwise.

Throws:

DOMException - NOT_SUPPORTED_ERR: May be raised if the implementation does not
support the feature "XML" and the language exposed
through the Document does not support XML Namespaces (such as [HTML 4.01]).

Since:

DOM Level 2

removeAttribute

Removes an attribute by name. If a default value for the removed
attribute is defined in the DTD, a new attribute immediately appears
with the default value as well as the corresponding namespace URI,
local name, and prefix when applicable. The implementation may handle
default values from other schemas similarly but applications should
use Document.normalizeDocument() to guarantee this
information is up-to-date.
If no attribute with this name is found, this method has no effect.
To remove an attribute by local name and namespace URI, use the
removeAttributeNS method.

Parameters:

name - The name of the attribute to remove.

Throws:

DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

removeAttributeNS

Removes an attribute by local name and namespace URI. If a default
value for the removed attribute is defined in the DTD, a new
attribute immediately appears with the default value as well as the
corresponding namespace URI, local name, and prefix when applicable.
The implementation may handle default values from other schemas
similarly but applications should use
Document.normalizeDocument() to guarantee this
information is up-to-date.
If no attribute with this local name and namespace URI is found,
this method has no effect.
Per [XML Namespaces]
, applications must use the value null as the
namespaceURI parameter for methods if they wish to have
no namespace.

Parameters:

namespaceURI - The namespace URI of the attribute to remove.

localName - The local name of the attribute to remove.

Throws:

DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NOT_SUPPORTED_ERR: May be raised if the implementation does not
support the feature "XML" and the language exposed
through the Document does not support XML Namespaces (such as [HTML 4.01]).

Since:

DOM Level 2

removeAttributeNode

Removes the specified attribute node. If a default value for the
removed Attr node is defined in the DTD, a new node
immediately appears with the default value as well as the
corresponding namespace URI, local name, and prefix when applicable.
The implementation may handle default values from other schemas
similarly but applications should use
Document.normalizeDocument() to guarantee this
information is up-to-date.

Parameters:

oldAttr - The Attr node to remove from the attribute
list.

Returns:

The Attr node that was removed.

Throws:

DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NOT_FOUND_ERR: Raised if oldAttr is not an attribute
of the element.

setAttribute

Adds a new attribute. If an attribute with that name is already present
in the element, its value is changed to be that of the value
parameter. This value is a simple string; it is not parsed as it is
being set. So any markup (such as syntax to be recognized as an
entity reference) is treated as literal text, and needs to be
appropriately escaped by the implementation when it is written out.
In order to assign an attribute value that contains entity
references, the user must create an Attr node plus any
Text and EntityReference nodes, build the
appropriate subtree, and use setAttributeNode to assign
it as the value of an attribute.
To set an attribute with a qualified name and namespace URI, use
the setAttributeNS method.

Parameters:

name - The name of the attribute to create or alter.

value - Value to set in string form.

Throws:

DOMException - INVALID_CHARACTER_ERR: Raised if the specified name is not an XML
name according to the XML version in use specified in the
Document.xmlVersion attribute.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

setAttributeNS

Adds a new attribute. If an attribute with the same local name and
namespace URI is already present on the element, its prefix is
changed to be the prefix part of the qualifiedName, and
its value is changed to be the value parameter. This
value is a simple string; it is not parsed as it is being set. So any
markup (such as syntax to be recognized as an entity reference) is
treated as literal text, and needs to be appropriately escaped by the
implementation when it is written out. In order to assign an
attribute value that contains entity references, the user must create
an Attr node plus any Text and
EntityReference nodes, build the appropriate subtree,
and use setAttributeNodeNS or
setAttributeNode to assign it as the value of an
attribute.
Per [XML Namespaces]
, applications must use the value null as the
namespaceURI parameter for methods if they wish to have
no namespace.

Parameters:

namespaceURI - The namespace URI of the attribute to create or
alter.

qualifiedName - The qualified name of the attribute to create or
alter.

value - The value to set in string form.

Throws:

DOMException - INVALID_CHARACTER_ERR: Raised if the specified qualified name is not
an XML name according to the XML version in use specified in the
Document.xmlVersion attribute.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NAMESPACE_ERR: Raised if the qualifiedName is
malformed per the Namespaces in XML specification, if the
qualifiedName has a prefix and the
namespaceURI is null, if the
qualifiedName has a prefix that is "xml" and the
namespaceURI is different from "
http://www.w3.org/XML/1998/namespace", if the qualifiedName or its prefix is "xmlns" and the
namespaceURI is different from "http://www.w3.org/2000/xmlns/", or if the namespaceURI is "http://www.w3.org/2000/xmlns/" and neither the qualifiedName nor its prefix is "xmlns".
NOT_SUPPORTED_ERR: May be raised if the implementation does not
support the feature "XML" and the language exposed
through the Document does not support XML Namespaces (such as [HTML 4.01]).

Since:

DOM Level 2

setAttributeNode

Adds a new attribute node. If an attribute with that name (
nodeName) is already present in the element, it is
replaced by the new one. Replacing an attribute node by itself has no
effect.
To add a new attribute node with a qualified name and namespace
URI, use the setAttributeNodeNS method.

Parameters:

newAttr - The Attr node to add to the attribute list.

Returns:

If the newAttr attribute replaces an existing
attribute, the replaced Attr node is returned,
otherwise null is returned.

Throws:

DOMException - WRONG_DOCUMENT_ERR: Raised if newAttr was created from a
different document than the one that created the element.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
INUSE_ATTRIBUTE_ERR: Raised if newAttr is already an
attribute of another Element object. The DOM user must
explicitly clone Attr nodes to re-use them in other
elements.

setAttributeNodeNS

Adds a new attribute. If an attribute with that local name and that
namespace URI is already present in the element, it is replaced by
the new one. Replacing an attribute node by itself has no effect.
Per [XML Namespaces]
, applications must use the value null as the
namespaceURI parameter for methods if they wish to have
no namespace.

Parameters:

newAttr - The Attr node to add to the attribute list.

Returns:

If the newAttr attribute replaces an existing
attribute with the same local name and namespace URI, the replaced
Attr node is returned, otherwise null is
returned.

Throws:

DOMException - WRONG_DOCUMENT_ERR: Raised if newAttr was created from a
different document than the one that created the element.
NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
INUSE_ATTRIBUTE_ERR: Raised if newAttr is already an
attribute of another Element object. The DOM user must
explicitly clone Attr nodes to re-use them in other
elements.
NOT_SUPPORTED_ERR: May be raised if the implementation does not
support the feature "XML" and the language exposed
through the Document does not support XML Namespaces (such as [HTML 4.01]).

Since:

DOM Level 2

setIdAttribute

If the parameter isId is true, this method
declares the specified attribute to be a user-determined ID attribute
. This affects the value of Attr.isId and the behavior
of Document.getElementById, but does not change any
schema that may be in use, in particular this does not affect the
Attr.schemaTypeInfo of the specified Attr
node. Use the value false for the parameter
isId to undeclare an attribute for being a
user-determined ID attribute.
To specify an attribute by local name and namespace URI, use the
setIdAttributeNS method.

Parameters:

name - The name of the attribute.

isId - Whether the attribute is a of type ID.

Throws:

DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NOT_FOUND_ERR: Raised if the specified node is not an attribute
of this element.

Since:

DOM Level 3

setIdAttributeNS

If the parameter isId is true, this method
declares the specified attribute to be a user-determined ID attribute
. This affects the value of Attr.isId and the behavior
of Document.getElementById, but does not change any
schema that may be in use, in particular this does not affect the
Attr.schemaTypeInfo of the specified Attr
node. Use the value false for the parameter
isId to undeclare an attribute for being a
user-determined ID attribute.

Parameters:

namespaceURI - The namespace URI of the attribute.

localName - The local name of the attribute.

isId - Whether the attribute is a of type ID.

Throws:

DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NOT_FOUND_ERR: Raised if the specified node is not an attribute
of this element.

Since:

DOM Level 3

setIdAttributeNode

If the parameter isId is true, this method
declares the specified attribute to be a user-determined ID attribute
. This affects the value of Attr.isId and the behavior
of Document.getElementById, but does not change any
schema that may be in use, in particular this does not affect the
Attr.schemaTypeInfo of the specified Attr
node. Use the value false for the parameter
isId to undeclare an attribute for being a
user-determined ID attribute.

Parameters:

idAttr - The attribute node.

isId - Whether the attribute is a of type ID.

Throws:

DOMException - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
NOT_FOUND_ERR: Raised if the specified node is not an attribute
of this element.

Since:

DOM Level 3

* Copyright (c) 2004 World Wide Web Consortium,
*
* (Massachusetts Institute of Technology, European Research Consortium for
* Informatics and Mathematics, Keio University). All Rights Reserved. This
* work is distributed under the W3C(r) Software License [1] in the hope that
* it will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231